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Discussion Starter #1
Hey all - I've been chasing an intermittent problem for a year or so, but it's only been really bad when it's cold (winter) and the engine is cold. 4 out of 5 times, the truck will start and run ok for a minute or so and from then until 15 minutes of running or so, it will sputter and die. When it's doing this, the WTS light will come on/flicker and I'm not sure if this is a symptom or cause (voltage drops as well, so it really is cycling the glow plugs).

The AE did show low values for the engine coolant so I replaced that sensor (and since it's got 280K, along with the ICP, IPR and CPS - all from RiffRaff) with no change.

Anyone have a thought on what to look at next? I've had the truck for about 18-yrs and have bounced around the different forums since then and can't recall anyone every mentioning the WTS light coming back on once the truck is running.

Truck runs pretty good once it warms up. THanks!
 

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Sounds like you have a couple of problems.

If the WTS light is coming back on without cycling the key you are loosing power to the PCM. You might try swapping relays in the under hood box. Also check fuses #9 which runs power to the PCM and #22 that supplies power to the PCM relay.

The sputtering and dying could be a fuel problem
 

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Discussion Starter #4
THanks for the replies, HeavyD - when checking for power, assume you mean the pins at the PCM?

I'll check the fuses/box/relays as well. I do think its something fuel related as well, just think it's something related to the electrical side of it rather than mechanical (or GP/gelling etc.).
 

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With the WTS light coming back on that is saying that the PCM lost power, the voltage drop would also show that the PCM lost power and activated the glow plugs just like a restart.

The sputtering and dying may or may not be another problem altogether. But if it sputters and dies and the WTS light doesn't not come on then I would suspect a fuel problem

It really sounds like you have two separate problems but from your description it may just be one.
 

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Discussion Starter #6
I might have characterized the "sputter" wrong, it doesn't start missing like you would feel when it's running out of fuel, more like a little surge in RPMs then it just quits.

If I'm going down hill and it quits (and I think this might be important) the tach still reads the RPMs that the wheels are spinning the engine at. If the entire PCM lost power, would the tach still work? Would this point to an internal problem with the PCM?

BTW, took it out to dinner and it ran fine the whole way. Temps are in the 50's though.
 

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Discussion Starter #7
Wanted to post a follow-up; replaced the sensors that weren't reading right -and it ran better, but was still chasing problems. Like a dummy, when I was thinking it might be a PCM issue, I didn't do the first thing i should've - pull the chip.

On a side note, even though it was a real (REAL) old Superchip, driving around w/o it for a few days makes me miss it. Forgot how much of a difference it makes.

Moral of the story - don't overlook the obvious things!
 
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